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What can be said about the experiments at Rocky Mountain Arsenal？
A) They have no practical value in earthquake prevention.
B) They may have practical value in earthquake prevention.
C) They are certain to have practical value in earthquake prevention.
D) The article does not say anything about their practical value in earthquake prevention.
答案
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第6题
What can be said about the experiments at Rocky Mountain Arsenal？
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B．They may have practical value in earthquake prevention
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